Image to Base64
Encoder
Upload any image and get its Base64 string or Data URI instantly. Copy with one click, processed entirely in your browser.
Click or drag an image to upload
PNG, JPG, WebP, GIF, SVG
How It Works
Upload Image
Drop or select any image file (PNG, JPG, WebP, GIF, SVG).
Encode
Your image is converted to Base64 instantly in the browser.
Copy
Copy the Base64 string or full Data URI with one click.
Convert images to Base64 strings online to embed them directly in HTML, CSS, JSON, or email templates. ConverterUp's image to Base64 tool generates a clean encoded string or a full data URI ready to paste into a stylesheet, an SVG sprite, or a markdown document. It is useful for offline-first apps, transactional emails that must work without external requests, and inlining tiny icons to save HTTP requests. The encoding runs entirely in the browser, so confidential mockups and internal screenshots never leave your machine.
Frequently asked questions
When should I inline an image as Base64?
Base64 makes sense for very small assets (under 4 KB) where a separate HTTP request would cost more than the size overhead. For larger images keep regular files because Base64 inflates size by about 33 %.
Is there a file size limit?
ConverterUp accepts images up to 25 MB. Encoded strings can become extremely long, so most editors and email clients struggle past a few megabytes.
What is the difference between a Base64 string and a data URI?
A Base64 string is just the encoded bytes, while a data URI prepends the MIME type, like data:image/png;base64,.... Use the full data URI in src or url() and the raw string when you provide the type elsewhere.
Which image formats are supported?
PNG, JPG/JPEG, WebP, AVIF, GIF, and SVG. The MIME type in the data URI is set automatically based on the file you upload.